EPA 608 Practice Questions and What the Exam Actually Covers

For technicians getting certified. Section 608 certification is required before you can legally handle regulated refrigerants, and the requirement is broader than most people expect. Attaching gauges to measure pressure is enough to trigger it. So is anything that opens up a small appliance.

This page covers which type you need, what each exam section tests, the passing score, how the open-book rule works, and practice questions written the way the real ones are written.

Which certification do you need

Four types. Picking the wrong one wastes a test fee.

If you are doing residential or light commercial service and install, Type II is the one that matters, and Universal is what most people end up with because the marginal effort is small once you are already studying.

Everyone takes the Core section regardless of type. You take Core plus whichever type sections you are going for.

Section 609 is a different certification covering automotive A/C. It does not substitute for 608 and 608 does not substitute for it.

How the exam works

Core is required for everything. It covers the regulatory and environmental material: ozone depletion and global warming background, the Clean Air Act requirements, recovery and recycling rules, safety, shipping, and the general refrigerant handling practices that apply no matter what equipment you are on.

The passing score is 70 percent on the closed-book exam, and each section is at least 25 questions. Type I taken in the mail-in format has a higher bar of 84 percent. Both figures are set by the regulation itself, in Appendix D to 40 CFR Part 82, Subpart F.

Type I can be taken in a mail-in format through an approved program. Types II, III, and Universal require a closed-book, proctored exam. There is a trap in this that catches people: per EPA's certification requirements, a Core section taken open book cannot be used toward Universal certification. If Universal is your goal, take Core proctored the first time rather than taking it twice.

It does not expire. Once you have it, you have it. No renewal, no continuing education, no recertification cycle. A card issued twenty years ago is still valid.

It is issued by EPA-approved certifying organizations, not by EPA. Which matters later: if you lose the card, you go back to whoever tested you. EPA's lost card guidance says the same.

What Core actually tests

Most people underestimate Core because it sounds like background reading. It is the section people retake.

The topics that carry the most questions:

• Recovery requirements. Evacuation levels required before opening a system, which depend on appliance type and size, and on whether the recovery equipment was manufactured before or after a cutoff date. This is the most heavily tested material in Core and the most commonly missed, because it is a table you have to actually know rather than reason through.
• Recovery, recycling, and reclamation, and the difference between the three. Reclaim means returned to virgin specification and verified by analysis. Recycle means cleaned for reuse on site. Recover means removed and stored.
• Leak repair thresholds and requirements for larger appliances.
• Cylinder handling and shipping. Fill limits, color coding, DOT requirements, where recovery cylinders go and how they are labeled.
• Safety. Oxygen deprivation, decomposition products when refrigerant meets a flame, pressure testing with nitrogen and the rule about never pressurizing with oxygen or compressed air.
• Dehydration and evacuation. Why you pull a vacuum, what a micron gauge is telling you, triple evacuation.

What Type II tests

Type II is the field section. If you have been doing the work, a lot of this is familiar, but the exam asks it in a specific way.

• Leak detection methods and their relative sensitivity.
• Recovery techniques for high-pressure systems, including the difference between vapor, liquid, and push-pull recovery and when each is appropriate.
• Evacuation requirements by appliance size.
• Charging practices, including why you charge liquid into the high side and vapor into the low side, and what happens when you get that backward.
• Leak repair requirements for commercial and industrial refrigeration.
• Safety and compressor handling, including what to do about a system that has had a burnout.

Practice questions

These are written the way the real exam writes them, which means the distractors are plausible rather than obviously wrong. They are representative, not copied from any real exam. Every answer and explanation is right here, not behind a signup: open any option to see why it is right or wrong.

• Recover the refrigerant to the required evacuation level Correct

  Venting regulated refrigerant is prohibited, and small appliances are not exempt from recovery requirements. The specific recovery level depends on the appliance and the equipment being used. This question appears on nearly every version of the exam because the correct answer is the whole point of the regulation.

• Vent the refrigerant slowly to minimize atmospheric impact Incorrect

  Venting is prohibited outright. Doing it slowly does not change that.

• Nothing, small appliances are exempt Incorrect

  Small appliances are covered. Opening one is exactly the kind of activity the certification requirement names.

• Pressurize the system with nitrogen first Incorrect

  Nitrogen is for pressure testing after repair, not a substitute for recovering the charge first.

• Refrigerant that has been cleaned on site with a recycling machine Incorrect

  That is recycled refrigerant: cleaned, typically on site, by separating oil and passing it through filter driers.

• Refrigerant reprocessed to virgin specification and verified by chemical analysis Correct

  Reclaim is the strict one: processed back to virgin specification, and that has to be verified by analysis. Exams lean on this distinction because recover, recycle, and reclaim sound interchangeable and are not.

• Refrigerant removed from a system and stored for reuse Incorrect

  That is recovered refrigerant: removed and stored, nothing more.

• Refrigerant that has been filtered and dried Incorrect

  Filtering and drying is part of recycling, and it does not meet the reclaim standard without analysis.

• It will contaminate the refrigerant oil Incorrect

  A real concern, but not the reason this is an absolute prohibition.

• It can form a combustible mixture with the refrigerant oil and detonate Correct

  The explosion hazard is why this is a prohibition rather than a best practice. Use dry nitrogen with a regulator.

• It introduces moisture into the system Incorrect

  Compressed air does carry moisture, and that is true, but it is not the reason the rule is absolute. The exam wants the explosion hazard.

• It damages the compressor windings Incorrect

  Not the hazard the rule exists for.

• Vapor recovery Incorrect

  Vapor recovery is the slowest of the three.

• Liquid recovery Incorrect

  Faster than vapor, but not the fastest option on a large charge.

• Push-pull Correct

  Push-pull moves liquid directly from the system into the recovery cylinder, using the recovery machine to create the pressure difference. It is the fastest method on systems with a large enough charge to justify setting it up.

• All three are equivalent Incorrect

  They are not, and the exam expects you to know the order.

• Overcharging Incorrect

  Possible with any charging method. Not the specific risk of liquid in the suction line.

• Compressor damage from liquid slugging Correct

  Compressors pump vapor. Liquid entering the suction line can reach the cylinder and cause mechanical damage. Liquid goes into the high side with the system off, or gets metered carefully through a restrictor into the suction line if it has to go in there at all.

• Inaccurate superheat readings Incorrect

  A side effect at most. The exam wants the mechanical risk.

• Nothing, this is standard practice Incorrect

  It is not, which is why the question is on the exam.

How to prepare

Study Core hardest. It is the section people fail and it is the least like the work you already do. The evacuation level requirements in particular are memorization, not reasoning.

Take Core proctored if there is any chance you will want Universal. An open-book Core cannot be applied toward it.

Do not study only practice questions. Exam question banks rotate, and a technician who memorized fifty questions walks into a test with a different fifty.

Find an approved program near you. EPA publishes the list of approved certification programs. Testing fees are modest and many programs bundle study material.

After you are certified

The card gets you legally cleared to do the work. It does not say anything about how good you are at it, which is a separate question and the one employers are actually trying to answer when they interview you.

It also puts you in the largest network of verified skilled technicians in the trades, which is what we are building here. Job opportunities get posted to that network over time, and the techs who are scored early are in it when they do. A card says you are allowed to do the work. A score says how well you do it.

Worth reading next: how to answer HVAC interview questions, including the diagnostic ones that trip people up.

Frequently asked questions

Raising the bar for the trades.